title: Urodynamic investigation of valve bladder syndrome in children.
abstract: OBJECTIVE
  To investigate urodynamic manifestations and their relationship with the postoperative experience of children with valve bladder syndrome (VBS).
  
  
  METHODS
  Included were 16 children (mean age 3.2+/-1.8 years) with VBS, who were divided into two groups. The urodynamic study was performed less than 1 year in group 1 (seven boys, aged 1-1.9 years) and more than 1 year in group 2 (nine boys, aged 2.9-6.5 years) after urethral valve fulguration; at the time of operation patients were less than 2 years old. Standards of the International Children's Continence Society were respected, and results were compared between the two groups.
  
  
  RESULTS
  Compared to group 1, group 2 showed a significant decrease in maximum detrusor voiding pressure (Pdet.void.max) and bladder compliance (BC), and an increase in post-voiding residual (PVR) and maximum bladder capacity (MBC) (p<0.05), but the difference in detrusor instability was not significant (p>0.05), Pdet.void.max and PVR were 56.2+/-14.1 cmH(2)O and 96.6+/-52.4 ml, respectively, in group 2, and there were more intermittent detrusor contractions during voiding in this group.
  
  
  CONCLUSIONS
  Patients with VBS frequently present with multiple bladder dysfunctions that can be diagnosed accurately using urodynamics. Even after urethral valve fulguration Pdet.void.max and BC were inclined to decrease, while PVR and MBC increased with the growth of the children.
authors.affiliation: The Pediatric Urodynamic Center, Department of Paediatric Surgery, First Teaching Hospital of Zhengzhou University, Institute of Clinical Medical Research Universities, No.1, Jianshe East Road, Henan Province, Zhengzhou City 450052, China. jgwen@zzu.edu.cn
authors.forename: Jian Guo
authors.initials: JG
authors.lastname: Wen
authors.forename: Yuan
authors.initials: Y
authors.lastname: Li
authors.forename: Qing Wei
authors.initials: QW
authors.lastname: Wang